| 摘要 |
PURPOSE:To permit the selective cooling or heating operation of respective indoor machines individually and simultaneously by a method wherein a changeover valve is provided between the first and second connecting pipelines a heat source machine while the first connecting pipeline is permitted to be switched to a low pressure and the second connecting pipeline is permitted to be switched to a high pressure. CONSTITUTION:A relay machine E, accommodating a first branching unit 10, a second flow rate control device 13, a third flow rate control device 15 and a second branching unit 11, is interposed between a heat source machine and a plurality of sets of indoor machines B, C, D. The diameter of a first connecting pipeline 6 is made larger than the same of a second connecting pipeline 7 and a changeover valve 40 is provided between the first and second connecting pipelines of the heat source machine A while the first connecting pipeline 6 is permitted to be switched to a low pressure and the second connecting pipeline 7 is permitted to be switched to a high pressure. |
